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L <br />2.3.2.4 Engineering and Chemical Properties of Waste <br />The engineering properties of municipal solids waste have been collected from literature. <br />Physical properties include density, moisture content, particle size and distribution, field capacity, <br />and porosity. Density varies because of the large variety of wastes, the degree of compaction, <br />state of decomposition, and the amount of daily cover and total waste. In general, uncompacted <br />waste densities can vary between 110 pounds per cubic yard (CY) for plastic to 550 pounds per <br />CY for ferrous metals. <br />NCRC&SL refuse placement density calculations indicate that approximately 1000 pounds of <br />refuse is placed in the landfill for each cubic yard airspace consumed by refuse and cover. The <br />density of refuse placed from June 5, 2013 to July 14, 2014 was approximately 1300 Ib/CY. <br />The chemical properties of wastes are important if evaluating recovery options, especially when <br />burned for energy recovery, which is not contemplated for this site at this time. The typical <br />proximate values (moisture, volatile matter, and ash) as well as densities are shown in Table 3. <br />North County RC&SL Page 11 of 68 Public Works/Solid Waste <br />Joint Technical Document County of San Joaquin — October 10, 2014 <br />